摘要 |
Disclosed is a valve for permitting passage of a flowable granular material from a pile of the material in a first direction while resisting the flow in a second direction. The valve comprises a valve housing defining a passageway (2) for flow therethrough, the passageway having an upper-passageway-defining surface (4), a lower passageway-defining surface (6), and first and second passageway-defining surfaces (8, 10) between the upper and lower surfaces. The upper and lower surfaces diverge and are structured to provide an angle of repose to the material from the pile.
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